diff --git a/ci/build.sh b/ci/build.sh
index 70978e2be2c76a7e0abd26f17f498fbfdb69745f..e4c6f18be202b6e413e61b4f656dfed997788778 100755
--- a/ci/build.sh
+++ b/ci/build.sh
@@ -74,7 +74,11 @@ run_cmd ${CONDA_ROOT}/bin/conda build "--python=${PYTHON_VERSION} --no-anaconda-
 
 # run git clean to clean everything that is not needed. This helps to keep the
 # disk usage on CI machines to minimum.
-if [ "$(uname -s)" == "Linux" ]; then _os="linux" else _os="osx"; fi
+if [ "$(uname -s)" == "Linux" ]; then
+  _os="linux"
+else
+  _os="osx"
+fi
 run_cmd git clean -ffdx \
     --exclude="miniconda.sh" \
     --exclude="miniconda/pkgs/*.tar.bz2" \